Fluid filter unit



FIG. 1 is a side elevational view of a fluid filter unit depicting the fluid inlet end at the top and the fluid outlet end at the bottom;

FIG. 2 is a bottom plan view of the filter unit facing the fluid outlet end;

FIG. 3 is a top plan view of the filter unit _facing the fluid inlet end; and

FIG. 4 is a perspective view of the filter unit. _ 

The ornamental design for a fluid filter unit, as shown. 